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Related Concept Videos

Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Integrins01:10

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Selectins01:25

Selectins

Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...

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Related Experiment Video

Updated: Jun 21, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
05:43

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers

Published on: November 8, 2024

Integrins in platelet activation.

B Nieswandt1, D Varga-Szabo, M Elvers

  • 1Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany. bernhard.nieswandt@virchow.uni-wuerzburg.de

Journal of Thrombosis and Haemostasis : JTH
|July 28, 2009
PubMed
Summary
This summary is machine-generated.

Platelet integrins beta1 and beta3 are crucial for blood clotting. Their activation, regulated by signaling pathways and proteins like talin-1, is key to hemostasis and thrombosis.

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Published on: June 5, 2019

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Platelet integrins, specifically beta1 and beta3, are heterodimeric receptors essential for hemostasis and thrombosis.
  • In resting platelets, these integrins exist in a low-affinity state, transitioning to high-affinity upon cellular activation to bind ligands effectively.

Purpose of the Study:

  • To review recent advancements in understanding the functional regulation of platelet integrins.
  • To elucidate the (patho-) physiological significance of individual platelet integrins, with an emphasis on studies using genetically modified mice.

Main Methods:

  • Review of existing literature focusing on platelet integrin function.
  • Analysis of data from genetically modified mouse models to study integrin roles in vivo.
  • Examination of signaling pathways involved in integrin activation.

Main Results:

  • Beta1 and beta3 integrins exhibit partially redundant roles in platelet adhesion.
  • Integrin activation is regulated by Ca2+-dependent and -independent signaling cascades.
  • Talin-1 and kindlin-3 are identified as critical proteins in the terminal activation step of integrins.

Conclusions:

  • Beta1 and beta3 integrins play vital, albeit partially redundant, roles in platelet adhesion and aggregation.
  • Shared regulatory mechanisms, including specific signaling events and key proteins, govern the activation of these integrins.
  • Understanding these mechanisms is crucial for comprehending normal hemostasis and pathological thrombosis.